Marlena wasn't the to turn her back on John and Marlena,JOHN was,the moment he was ''afraid of the past'' as Old John put it was when he did,the second he destroyed the disc and lab was when he turned his back.Marlena has been through an emotional rollercoaster the last 11 months,you cannot go thru what she has and not be changed in some way,thats what happens in life good or crappy situations can change us and make us think differently.